How to Calculate Square Footage
Square footage is the area of a space measured in square feet. It is the standard measurement for real estate, flooring, and construction in the US.
The Formula
Area = Length x WidthWhere:
LLength — The longer side of the spaceWWidth — The shorter side of the spaceAArea — Result in square feetStep-by-Step Example
Here's how to calculate square footage step by step:
- 1Measure length: Measure the length of the space in feet.
- 2Measure width: Measure the width of the space in feet.
- 3Multiply: Multiply length by width to get square footage.
- 4Handle irregular shapes: Break complex rooms into rectangles and sum their areas.
Following these 4 steps gives you the final square footage value.
Skip the Math
A room that is 12 feet long and 10 feet wide has 120 square feet, which helps you know how much flooring to purchase.
Use the Free CalculatorWhy You Need This Calculation
- Square footage determines material quantities, rental costs, and property values for any building project.
Common Mistakes
Mixing units like inches and feet.
Convert all measurements to the same unit before multiplying.
Forgetting to account for irregular room shapes.
Split L-shaped rooms into separate rectangles.
Measuring only one wall of a non-square room.
Always measure both length and width independently.